Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

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subwoofer turns on and off

My macbook pro seems to be having an issue with the subwoofer going off and on. I have checked all connections to the logic board and everything seems good. both left and right speakers work fine. I have noticed that when i tap on the back of the laptop, sometimes this helps and the woofer will turn on for a while, then it turns back off. Do i need to replace this?

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It's very likely the cable is bad for the subwoofer or the connector is bad on the logic board winch would need to be resoldered back on. I'm assuming your laptop has been disassembled before and that's why you're having this issue.

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I checked the logic board and everything looks good on there. Yes i took the laptop apart myself am a technician. Ive just never had any issues like this before. I will replace it and see if the problem continues. Its weird though because it works for a while, then just turns off periodically.

Does the left speaker connection have anything to do with the right/subwoofer? I see its a different connection on the underside of the board, but just thought id ask.

Ryan, no it does not

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